Deployment system for deployable sofa, and deployable sofa

ABSTRACT

The present invention relates to a deployment system for a deployable sofa. The deployment system includes a deployment apparatus, and the deployment apparatus includes a bottom fixing member, a support, a swinging rod, a first multi-link rod mechanism, and a second multi-link rod mechanism, where the bottom fixing member is used to be fixedly mounted to a sofa bottom frame; the support is used to support a sofa seat; the swinging rod is rotatably connected to the support by means of the first multi-link rod mechanism, and the swinging rod is rotatably connected to the bottom fixing member by means of the second multi-link rod mechanism; the second multi-link rod mechanism is constructed to be capable of enabling the swinging rod to move approximately parallel to the bottom fixing member; and the first multi-link rod mechanism is constructed to be capable of transferring translation of the swinging rod to the support, to enable the support to move approximately parallel to the bottom fixing member. The present invention eliminates a jitter phenomenon during deployment of a deployable sofa, and a link rod mechanism is used to improve synchronicity and reduce manufacturing difficulty and maintenance fees.

BACKGROUND Technical Field

The present invention relates to the field of furniture, and in particular, to a deployment system for a deployable sofa, and a deployable sofa.

Related Art

Currently, existing deployment systems for deployable sofas use roller rail structures. The deployment systems for deployable sofas that use the roller rail structures are, to some extent, cheaper than mechanisms whose motion is provided depending on link rod apparatuses. However, sofa deployment apparatuses using the roller rail structures have some disadvantages: during mechanical deployment, there is a jitter phenomenon, and left and right mechanical deployment apparatuses have poor synchronicity, resulting in an impact on comfort of an electrical sofa; as compared with the link rod structures, a tighter tolerance is needed in production and manufacturing; during use, maintenance needs to be performed more frequently, and as compared with the link rod apparatuses, higher costs are needed.

SUMMARY

An objective of the present invention is to provide a deployment system for a deployable sofa and a deployable sofa, so as to eliminate a jitter phenomenon during deployment of the deployable sofa, and provide relatively good synchronicity.

To achieve the foregoing objective, the present invention provides a deployment system for a deployable sofa, where the deployment system includes a deployment apparatus, and the deployment apparatus includes a bottom fixing member, a support, a swinging rod, a first multi-link rod mechanism, and a second multi-link rod mechanism, where

the bottom fixing member is used to be fixedly mounted to a sofa bottom frame;

the support is used to support a sofa seat;

the swinging rod is rotatably connected to the support by means of the first multi-link rod mechanism, and the swinging rod is rotatably connected to the bottom fixing member by means of the second multi-link rod mechanism;

the second multi-link rod mechanism is constructed to be capable of enabling the swinging rod to move approximately parallel to the bottom fixing member; and

the first multi-link rod mechanism is constructed to be capable of transferring translation of the swinging rod to the support, to enable the support to move approximately parallel to the bottom fixing member.

In a preferable or optional embodiment, the first multi-link rod mechanism includes a second pivotal member and at least one lower transmission connecting member, where a lower end portion of the lower transmission connecting member and a lower end portion of the second pivotal member are both rotatably connected to the swinging rod, and an upper end portion of the lower transmission connecting member and an upper end portion of the second pivotal member are both rotatably connected to the support, so that the support, the swinging rod, the second pivotal member, and one of the at least one lower transmission connecting member form a four-link rod mechanism.

In a preferable or optional embodiment, the second multi-link rod mechanism includes a second transmission rod, a second connecting member, a fifth connecting member, a third transmission rod, a fourth transmission rod, a third pivotal member, and a first connecting member;

a front end portion of the swinging rod is rotatably connected to a lower end portion of the first connecting member, a front end portion of the bottom fixing member is rotatably connected to a lower end portion of the third pivotal member, and an upper end portion of the first connecting member is hingedly connected to a position, located between two end portions of the third pivotal member, on the third pivotal member;

a rear end portion of the swinging rod is rotatably connected to a lower end portion of the third transmission rod, a rear end portion of the bottom fixing member is rotatably connected to a lower end portion of the fourth transmission rod, and an upper end portion of the third transmission rod is hingedly connected to a position, located between two end portions of the fourth transmission rod, on the fourth transmission rod;

a front end portion of the second transmission rod is rotatably connected to an upper end portion of the third pivotal member, a rear end portion of the second transmission rod is rotatably connected to a front end portion of the second connecting member and a front end portion of the fifth connecting member, a rear end portion of the second connecting member is hingedly connected to a position, located between two end portions of the third transmission rod, on the third transmission rod, and a rear end portion of the fifth connecting member is rotatably connected to an upper end portion of the fourth transmission rod.

In a preferable or optional embodiment, a limiting block is disposed at each of positions, located on two sides of the fourth transmission rod, on the bottom fixing member, and the two limiting blocks are used to limit clockwise or counterclockwise rotation of the fourth transmission rod.

In a preferable or optional embodiment, the deployment apparatus further includes a pedal deployment mechanism used to support a sofa pedal and capable of deploying and retracting the sofa pedal, and the pedal deployment mechanism is disposed in front of the support.

In a preferable or optional embodiment, the pedal deployment mechanism includes a pedal swinging rod, a front swinging member, a first link rod, a second link rod, and a pedal apparatus;

a rear end portion of the pedal swinging rod is rotatably connected to the support and the second pivotal member, and a front end portion of the pedal swinging rod is rotatably connected to a rear end portion of the front swinging member;

a rear end portion of the second link rod is rotatably connected to the support, a front end portion of the second link rod is rotatably connected to a rear end portion of the first link rod, and a portion, located between two end portions of the second link rod, of the second link rod is further rotatably connected to a portion, located between two end portions of the front swinging member, of the front swinging member; and

both a front end portion of the front swinging member and a front end portion of the first link rod may be drivably connected to the pedal apparatus, so that the pedal apparatus can deploy and support the sofa pedal.

In a preferable or optional embodiment, a front end portion of the front swinging member is rotatably connected to a rear end portion of a fourth link rod, a front end portion of the first link rod is rotatably connected to a position, located between two end portions of the fourth link rod, on the fourth link rod, a front end portion of the fourth link rod is rotatably connected to a rear end portion of a first plate member, a front end portion of the first plate member is rotatably connected to a rear end portion of the pedal apparatus, a second plate member is fixedly connected to the fourth link rod, an end of a tension spring is connected to the second plate member, and the other end of the tension spring is connected to a position, located between two end portions of the pedal apparatus, on the pedal apparatus.

In a preferable or optional embodiment, the pedal deployment mechanism further includes a U-shaped member, and the U-shaped member is rotatably connected to the first link rod and the front swinging member separately and is used to support legs of a user.

In a preferable or optional embodiment, the deployment apparatus further includes a back deployment mechanism used to support a sofa backrest and capable of deploying and retracting the sofa backrest, and the back deployment mechanism is disposed behind the support.

In a preferable or optional embodiment, the back deployment mechanism includes a third link rod, a back transmission rod, a first pivotal member, a crank, and a fourth connecting member, and the crank is fixedly disposed on the support;

a lower end portion of the fourth connecting member is rotatably connected to the bottom fixing member, and an upper end portion of the fourth connecting member is rotatably connected to a lower end portion of the first pivotal member;

a position, located between two end portions of the first pivotal member, on the first pivotal member is rotatably connected to the crank; and

an upper end portion of the first pivotal member is rotatably connected to a lower end portion of the back transmission rod, an upper end portion of the back transmission rod is rotatably connected to a rear end portion of the third link rod, and a front end portion of the third link rod is rotatably connected to the crank, so that the sofa backrest can be deployed or retracted by driving the third link rod.

In a preferable or optional embodiment, the deployment system further includes a power apparatus, and the power apparatus is used to drive the support to move approximately parallel to the bottom fixing member and used to drive deployment and retraction of the pedal deployment mechanism and drive deployment and retraction of of the back deployment mechanism.

In a preferable or optional embodiment, the deployment system includes two deployment apparatuses, the two deployment apparatuses are respectively disposed on two sides of the sofa seat, a front drive tube and a rear drive tube are separately disposed between the two deployment apparatuses, two end portions of the front drive tube are connected to the support on a corresponding side, and two end portions of the rear drive tube are connected to the bottom fixing member on a corresponding side.

In a preferable or optional embodiment, a power apparatus used to drive the support to move relative to the bottom fixing member is disposed on the rear drive tube.

In a preferable or optional embodiment, the power apparatus can drive the front drive tube, so as to drive the front drive tube to actuate the support to move relative to the bottom fixing member.

To achieve the foregoing objective, the present invention further provides a deployable sofa, including the foregoing deployment system for a deployable sofa.

Based on the foregoing technical solutions, the present invention has at least the following beneficial effects:

In the deployment system for a deployable sofa provided by the present invention, components are rotatably connected, and a swinging rod, a first multi-link rod mechanism, and a second multi-link rod mechanism cooperate with each other, so that a support moves approximately parallel to a bottom fixing member, thereby resolving a jitter phenomenon of the deployment system for a deployable sofa during deployment. In addition, use of a link rod mechanism can improve synchronicity of the deployment system, and manufacturing difficult and maintenance costs are both relatively low.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings are included to provide a further understanding of the present invention, and constitute a part of this specification, but are not intended to limit the present invention. In the accompanying drawings:

FIG. 1 is a schematic structural diagram during full retraction of a deployment system for a deployable sofa according to the present invention;

FIG. 2 is a schematic structural diagram during full deployment of a pedal deployment mechanism of a deployment system for a deployable sofa according to the present invention;

FIG. 3 is a schematic structural diagram during full deployment of a back deployment mechanism of a deployment system for a deployable sofa according to the present invention;

FIG. 4 is a schematic structural diagram of an intermediate state of deployment of a deployment system for a deployable sofa according to the present invention;

FIG. 5 is a rear view of a deployment system for a deployable sofa according to the present invention;

FIG. 6(a) to FIG. 6(d) are schematic diagrams of a second multi-link rod mechanism of a deployment system for a deployable sofa in a retracted state, a motion start state, an intermediate state, and a deployed state respectively according to the present invention; and

FIG. 7 is a brief structural of interaction between a pedal apparatus and a plate member and a link rod in a deployment system for a deployable sofa according to the present invention.

Reference signs in the accompanying drawings:

1—pedal apparatus; 2—first link rod; 3—front swinging member; 4—U-shaped member; 5—pedal swinging rod; 6—second link rod; 7—fourth connecting member; 8—first pivotal member; 9—first lower transmission connecting member; 10—second lower transmission connecting member; 11—second pivotal member; 12—support; 13—crank; 14—third link rod; 15—back transmission rod; 16—fourth link rod; 17—first plate member; 18—swinging rod; 19—first L-shaped member; 20—bottom fixing member; 21—third pivotal member; 22—first connecting member; 23—second transmission rod; 24—second plate member; 25—second connecting member; 26—third transmission rod; 27—fourth transmission rod; 28—rear drive tube; 29—third connecting member; 30—front drive tube; 31—solder sheet; 32—second L-shaped member; 33—connecting tube; 34—first limiting block; 35—second limiting block; 36—tension spring; 37—fifth connecting member.

DETAILED DESCRIPTION

The technical solutions in embodiments are clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are merely some rather than all of the embodiments of the present invention. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

In the description of the present invention, it should be understood that, location or position relationships indicated by the terms, such as “center”, “longitude”, “transverse”, “front”, “rear”, “left”, “right”, “vertical”, “horizon”, “top”, “bottom”, “inside”, and “outside”, are location or position relationships based on illustration of the accompanying drawings, are merely used for describing the present invention and simplifying the description instead of indicating or implying the indicated apparatuses or elements should have specified locations or be constructed and operated according to specified locations, and therefore, should not be interpreted as limitations to the present invention.

In the description of the present invention, a sofa seat is used as a reference object, a pedal deployment mechanism is disposed in front of the sofa seat, a back deployment mechanism is disposed behind the sofa seat. In each component shown in the figures, an end portion proximal to the pedal deployment mechanism is a front end portion, and an end portion proximal to the back deployment mechanism is a rear end portion.

As shown in FIG. 1 to FIG. 5, an exemplary embodiment of a deployment system for a deployable sofa is provided by the present invention. In this exemplary embodiment, deployment system for a deployable sofa includes a deployment apparatus, and the deployment apparatus includes a bottom fixing member 20, a support 12, a swinging rod 18, a first multi-link rod mechanism, and a second multi-link rod mechanism, where the bottom fixing member 20 is used to be fixedly mounted to a sofa bottom frame, and the bottom fixing member 20 is fixed;

the support 12 is used to support a sofa seat;

the swinging rod 18 is rotatably connected to the support 12 by means of the first multi-link rod mechanism, and the swinging rod 18 is rotatably connected to the bottom fixing member 20 by means of the second multi-link rod mechanism;

the second multi-link rod mechanism is constructed to be capable of enabling the swinging rod 18 to move approximately parallel to the bottom fixing member 20; and

the first multi-link rod mechanism is constructed to be capable of transferring translation of the swinging rod 18 to the support 12, to enable the support 12 to move approximately parallel to the bottom fixing member 20.

In an exemplary embodiment of the deployment system for a deployable sofa provided by the present invention, the first multi-link rod mechanism includes a second pivotal member 11 and at least one lower transmission connecting member, for example, a first lower transmission connecting member 9 and a second lower transmission connecting member 10, where a lower end portion of the lower transmission connecting member and a lower end portion of the second pivotal member 11 are both rotatably connected to the swinging rod 18, and an upper end portion of the lower transmission connecting member and an upper end portion of the second pivotal member 11 are both rotatably connected to the support 12, so that the support 12, the swinging rod 18, the second pivotal member 11, and one lower transmission connecting member form a four-link rod mechanism.

As shown in FIG. 6(a) to FIG. 6(d), the second multi-link rod mechanism may include a second transmission rod 23, a second connecting member 25, a fifth connecting member 37, a third transmission rod 26, a fourth transmission rod 27, a third pivotal member 21, and a first connecting member 22;

a front end portion of the swinging rod 18 is rotatably connected to a lower end portion of the first connecting member 22, a front end portion of the bottom fixing member 20 is rotatably connected to a lower end portion of the third pivotal member 21, and an upper end portion of the first connecting member 22 is hingedly connected to a position, located between two end portions of the third pivotal member 21, on the third pivotal member 21;

a rear end portion of the swinging rod 18 is rotatably connected to a lower end portion of the third transmission rod 26, a rear end portion of the bottom fixing member 20 is rotatably connected to a lower end portion of the fourth transmission rod 27, and an upper end portion of the third transmission rod 26 is hingedly connected to a position, located between two end portions of the fourth transmission rod 27, on the fourth transmission rod 27;

a front end portion of the second transmission rod 23 is rotatably connected to an upper end portion of the third pivotal member 21, a rear end portion of the second transmission rod 23 is rotatably connected to a front end portion of the second connecting member 25 and a front end portion of the fifth connecting member 37, a rear end portion of the second connecting member 25 is hingedly connected to a position, located between two end portions of the third transmission rod 26, on the third transmission rod 26, and a rear end portion of the fifth connecting member 37 is rotatably connected to an upper end portion of the fourth transmission rod 27.

In a preferable or optional embodiment, a limiting block is disposed at each of positions, located on two sides of the fourth transmission rod 27, on the bottom fixing member 20, and as shown in FIG. 3, a first limiting block 34 and a second limiting block 35 are disposed on the fourth transmission rod 27 respectively on two sides of the fourth transmission rod 27, and the two limiting blocks are used to limit clockwise or counterclockwise rotation of the fourth transmission rod 27.

In an exemplary embodiment of the deployment system for a deployable sofa provided by the present invention, the deployment apparatus may further include a pedal deployment mechanism used to support a sofa pedal and capable of deploying and retracting the sofa pedal. The deployment apparatus may further include a back deployment mechanism used to support a sofa backrest and capable of deploying and retracting the sofa backrest. The pedal deployment mechanism is disposed in front of the support 12, and the back deployment mechanism is disposed behind the support 12.

As shown in FIG. 2 and FIG. 3, in an exemplary embodiment of the deployment system for a deployable sofa provided by the present invention, the pedal deployment mechanism may include a pedal swinging rod 5, a front swinging member 3, a first link rod 2, a second link rod 6, and a pedal apparatus 1;

a rear end portion of the pedal swinging rod 5 is rotatably connected to the support 12 and the second pivotal member 11, and a front end portion of the pedal swinging rod 5 is rotatably connected to a rear end portion of the front swinging member 3;

a rear end portion of the second link rod 6 is rotatably connected to the support 12, a front end portion of the second link rod 6 is rotatably connected to a rear end portion of the first link rod 2, and a position, located between two end portions of the second link rod 6, on the second link rod 6 is further rotatably connected to a position, located between two end portions of the front swinging member 3, on the front swinging member 3; and

both a front end portion of the front swinging member 3 and a front end portion of the first link rod 2 may be drivably connected to the pedal apparatus 1, so that the pedal apparatus 1 can deploy and support the sofa pedal.

As shown in FIG. 7, a front end portion of the front swinging member 3 is rotatably connected to a rear end portion of a fourth link rod 16, a front end portion of the first link rod 2 is rotatably connected to a position, located between two end portions of the fourth link rod 16, on the fourth link rod 16, a front end portion of the fourth link rod 16 is rotatably connected to a rear end portion of a first plate member 17, a front end portion of the first plate member 17 is rotatably connected to a rear end portion of the pedal apparatus 1, a second plate member 24 is fixedly connected to the fourth link rod 16, an end of a tension spring 36 is connected to the second plate member 24, and the other end of the tension spring 36 is connected to a position, located between two end portions of the pedal apparatus 1, on the pedal apparatus 1.

Further, as shown in FIG. 2 and FIG. 3, the pedal deployment mechanism further includes a U-shaped member 4, the U-shaped member 4 is rotatably connected to the first link rod 2 and the front swinging member 3 separately, and the U-shaped member 4 can move with the first link rod 2 and the front swinging member 3 and and is used to support legs of a user.

As shown in FIG. 4, in an exemplary embodiment of the deployment system for a deployable sofa provided by the present invention, the back deployment mechanism includes a third link rod 14, a back transmission rod 15, a first pivotal member 8, a crank 13, and a fourth connecting member 7, and the crank 13 is fixedly disposed on the support 12;

a lower end portion of the fourth connecting member 7 is rotatably connected to the bottom fixing member 20, and an upper end portion of the fourth connecting member 7 is rotatably connected to a lower end portion of the first pivotal member 8;

a position, located between two end portions of the first pivotal member 8, on the first pivotal member 8 is rotatably connected to the crank 13; and

an upper end portion of the first pivotal member 8 is rotatably connected to a lower end portion of the back transmission rod 15, an upper end portion of the back transmission rod 15 is rotatably connected to a rear end portion of the third link rod 14, and a front end portion of the third link rod 14 is rotatably connected to the crank 13, so that the sofa backrest can be deployed or retracted by driving the third link rod 14.

In an exemplary embodiment of the deployment system for a deployable sofa provided by the present invention, the deployment system for a deployable sofa may further include a power apparatus, and the power apparatus is used to drive the support 12 to move approximately parallel to the bottom fixing member 20 and used to drive deployment and retraction of the pedal deployment mechanism and drive deployment and retraction of of the back deployment mechanism.

In an exemplary embodiment of the deployment system for a deployable sofa provided by the present invention, the deployment system for a deployable sofa includes two deployment apparatuses, the two deployment apparatuses are respectively disposed on two sides of the sofa seat, a front drive tube 30 (as shown in FIG. 4) and a rear drive tube 28 (as shown FIG. 5) are separately disposed between the two deployment apparatuses, two end portions of the front drive tube 30 are connected to the support 12 on a corresponding side, and two end portions of the rear drive tube 28 are connected to the bottom fixing member 20 on a corresponding side.

A power apparatus used to drive the support 12 to move relative to the bottom fixing member 20 is disposed on the rear drive tube 28. The power apparatus can drive the front drive tube 30, so as to drive the front drive tube 30 to actuate 12 the support to move relative to the bottom fixing member 20.

Further, a solder sheet 31 may be disposed on the front drive tube 30, and the power apparatus is drivably connected to the solder sheet 31 by means of a push rod, so as to actuate, by means of the front drive tube 30, the support 12 to move relative to the bottom fixing member 20.

Further, two end portions of the front drive tube 30 are both rotatably connected to the support 12 on a corresponding side by means of a second L-shaped member 32, and two end portions of the rear drive tube 28 are both rotatably connected to the bottom fixing member 20 on a corresponding side by means of a first L-shaped member 19.

In a preferable or optional embodiment, a connecting tube 33 is further disposed between two deployment apparatuses (as shown in FIG. 4). Two ends of the connecting tube 33 are respectively fixedly connected to the swinging rods 18 in the deployment apparatuses correspondingly, so as to further improve synchronicity and stability between the two deployment apparatuses.

In the deployment system for a deployable sofa provided by the present invention, link rod design is used, and rotatable connections between components may all be implemented as rivet connections. Favorable synchronicity is achieved, left-right unbalance and apparatus jitter problems will not occur during mechanical deployment, favorable stability is achieved, a structure is simple, and assembly is convenient. Maintenance does not need to be performed frequently, and maintenance fees are low.

The deployment system for a deployable sofa provided by the present invention may be applied to a deployable sofa or another device that needs to be deployed and retracted such as a seat or a bed.

The deployable sofa provided by the present invention includes the deployment system for a deployable sofa in any one of the foregoing embodiments.

A specific embodiment of the deployment system for a deployable sofa provided by the present invention is exemplified below with reference to FIG. 1 to FIG. 5. In this specific embodiment, the deployment system for a deployable sofa includes a power apparatus and a deployment apparatus.

The deployment apparatus is constituted by components such as a pedal apparatus 1, a first link rod 2, a front swinging member 3, a U-shaped member 4, a pedal swinging rod 5, a second link rod 6, a fourth connecting member 7, a first pivotal member 8, a first lower transmission connecting member 9, a second lower transmission connecting member 10, a second pivotal member 11, a support 12, a crank 13, a third link rod 14, a back transmission rod 15, a fourth link rod 16, a first plate member 17, a swinging rod 18, a first L-shaped member 19, a bottom fixing member 20, a third pivotal member 21, a first connecting member 22, a second transmission rod 23, a second plate member 24, a second connecting member 25, a third transmission rod 26, a fourth transmission rod 27, a rear drive tube 28, a third connecting member 29, a front drive tube 30, a solder sheet 31, a second L-shaped member 32, and a connecting tube 33.

The solder sheet 31 is disposed on the front drive tube 30, the front drive tube 30 is connected to the second L-shaped member 32 by means of a screw, the second L-shaped member 32 is rotatably connected to the pedal swinging rod 5, and the pedal swinging rod 5 is rotatably connected to the support 12, the second pivotal member 11, and the front swinging member 3. The U-shaped member 4 is rotatably connected to the first link rod 2 and the front swinging member 3. The second link rod 6 is rotatably connected to the first link rod 2, the front swinging member 3, and the support 12. The first link rod 2 is rotatably connected to the fourth link rod 16.

The first lower transmission connecting member 9 and the second lower transmission connecting member 10 are rotatably connected to the support 12, the crank 13 is fixedly disposed on the support 12, and the crank 13 is rotatably connected to the third link rod 14. The back transmission rod 15 is rotatably connected to the third link rod 14 and the first pivotal member 8.

The fourth connecting member 7, the first L-shaped member 19, the third pivotal member 21, and the third transmission rod 26 are rotatably connected to the bottom fixing member 20. The fourth transmission rod 27 is rotatably connected to the swinging rod 18 and the third transmission rod 26. The second transmission rod 23 is rotatably connected to the third pivotal member 21 and the second connecting member 25. The first connecting member 22 is transmission-connected to the swinging rod 18 and the third pivotal member 21. The fourth connecting member 7 is rotatably connected to the first L-shaped member 19.

The connecting tube 33 is disposed on a side surface of the swinging rod 18. A first limiting block 34 and a second limiting block 35 are disposed on the fourth transmission rod 27 respectively on two sides of the fourth transmission rod 27.

The third connecting member 29 is disposed on the rear drive tube 28, and the third connecting member 29 is used to connect to the power apparatus. In this specific embodiment, the power apparatus is a motor, the motor is not drawn in the figures, and the motor is connected to the third connecting member 29 of the rear drive tube 28 by means of a screw.

In the foregoing specific embodiments, rotatable connections between components may all be implemented as rivet connections.

FIG. 1 and FIG. 2 show a process of full deployment of a pedal deployment mechanism in a specific embodiment of a deployment system for a deployable sofa provided by the present invention.

A user drives a motor, and after the motor is started, a motor push rod pushes the solder sheet 31 to rotate. Rotation of the solder sheet 31 actuates rotation of the front drive tube 30 that is connected to the solder sheet 31. The rotation of the front drive tube 30 actuates rotation of the pedal swinging rod 5 that is connected to the front drive tube 30 and translation of the support 12. Rotation of the pedal swinging rod 5 actuates rotation of the front swinging member 3 and the second link rod 6 that are connected to the pedal swinging rod 5. At the same time, the translation of the support 12 actuates synchronous rotation of the second pivotal member 11, the first lower transmission connecting member 9, and the second lower transmission connecting member 10. The swinging rod 18 relates to the left side of the apparatus. The translation of the support 12 also actuates rotation of the crank 13, the first pivotal member 8, and the fourth connecting member 7. The deployment apparatus is gradually deployed.

Rotation of the front swinging member 3 and the second link rod 6 actuates rotation of the first link rod 2, and further, is transferred to the fourth link rod 16. The fourth link rod 16 is connected to the first plate member 17 and the pedal apparatus 1 and moves together with them. The U-shaped member 4 is rotatably connected to the first link rod 2 and the front swinging member 3, and moves synchronously with the first link rod 2 and the front swinging member 3 until the pedal apparatus 1 rotates to a horizontal position. Therefore, full deployment of the pedal deployment mechanism in this specific embodiment is implemented.

FIG. 2 and FIG. 3 show a process of full deployment of a back deployment mechanism in a specific embodiment of a deployment system for a deployable sofa provided by the present invention.

After the motor is started, the swinging rod 18 continues to translate to the left side of the apparatus, and implements stable motion by means of the first lower transmission connecting member 9, the second lower transmission connecting member 10, the first connecting member 22, and the third transmission rod 26 that are rotatably connected to the swinging rod 18. The bottom fixing member 20 is fixed. The third transmission rod 26 rotates to the right side of the apparatus, and the fourth transmission rod 27 moves to the left side. Meanwhile, the support 12 continues to translate to the left side. The first pivotal member 8 rotates to the right side. The fourth connecting member 7 rotates to the left side. The first pivotal member 8 deploys the third link rod 14 by means of the back transmission rod 15. At this point, full deployment of the back deployment mechanism of this specific embodiment is implemented.

In this specific embodiment, the first limiting block 34 and the second limiting block 35 are disposed on two sides of the fourth transmission rod 27, and when moving clockwise or counterclockwise to the first limiting block 34 or the second limiting block 35, the fourth transmission rod 27 immediately stops moving, so that motion of the sofa is completed.

When the deployment system for a deployable sofa switches from a state in FIG. 1 to a state in FIG. 2 to a state in FIG. 3 and further switches from the state in FIG. 3 to the state in FIG. 2 to the state in FIG. 1, a complete electrical deployment and retraction process of the deployment system for a deployable sofa is implemented.

In the description of the present invention, it should be understood that the terms, such as “first”, “second”, “third”, and “fourth”, are used to define components merely for convenience in distinguishing the foregoing components. Unless otherwise specified, the foregoing terms do not have special meaning, and therefore, should not be interpreted as limitations to the protection scope of the present invention.

Finally, it should be noted that: the foregoing embodiments are merely intended for describing the technical solutions of the present invention instead of limiting the present invention. Although the present invention is described in detail with reference to the foregoing preferred embodiments, persons of ordinary skill in the art should understand that they may still make modifications to the specific implementation manners of the present invention or make equivalent replacements to some technical features, without departing from the spirit of the technical solutions of the embodiments of the present invention. The modifications and equivalent replacements should all fall within the scope of the technical solutions claimed in the present invention. 

What is claimed is:
 1. A deployment system for a deployable sofa, wherein the deployment system comprises a deployment apparatus, and the deployment apparatus comprises a bottom fixing member, a support, a swinging rod, a first multi-link rod mechanism, and a second multi-link rod mechanism, wherein the bottom fixing member is used to be fixedly mounted to a sofa bottom frame; the support is used to support a sofa seat; the swinging rod is rotatably connected to the support by means of the first multi-link rod mechanism, and the swinging rod is rotatably connected to the bottom fixing member by means of the second multi-link rod mechanism; the second multi-link rod mechanism is constructed to be capable of enabling the swinging rod to move approximately parallel to the bottom fixing member; and the first multi-link rod mechanism is constructed to be capable of transferring translation of the swinging rod to the support, to enable the support to move approximately parallel to the bottom fixing member.
 2. The deployment system for a deployable sofa according to claim 1, wherein the first multi-link rod mechanism comprises a second pivotal member and at least one lower transmission connecting member, wherein a lower end portion of the lower transmission connecting member and a lower end portion of the second pivotal member are both rotatably connected to the swinging rod, and an upper end portion of the lower transmission connecting member and an upper end portion of the second pivotal member are both rotatably connected to the support, so that the support, the swinging rod, the second pivotal member, and one of the at least one lower transmission connecting member form a four-link rod mechanism.
 3. The deployment system for a deployable sofa according to claim 2, wherein the second multi-link rod mechanism comprises a second transmission rod, a second connecting member, a fifth connecting member, a third transmission rod, a fourth transmission rod, a third pivotal member, and a first connecting member; a front end portion of the swinging rod is rotatably connected to a lower end portion of the first connecting member, a front end portion of the bottom fixing member is rotatably connected to a lower end portion of the third pivotal member, and an upper end portion of the first connecting member is hingedly connected to a position, located between two end portions of the third pivotal member, on the third pivotal member; a rear end portion of the swinging rod is rotatably connected to a lower end portion of the third transmission rod, a rear end portion of the bottom fixing member is rotatably connected to a lower end portion of the fourth transmission rod, and an upper end portion of the third transmission rod is hingedly connected to a position, located between two end portions of the fourth transmission rod, on the fourth transmission rod; a front end portion of the second transmission rod is rotatably connected to an upper end portion of the third pivotal member, a rear end portion of the second transmission rod is rotatably connected to a front end portion of the second connecting member and a front end portion of the fifth connecting member, a rear end portion of the second connecting member is hingedly connected to a position, located between two end portions of the third transmission rod, on the third transmission rod, and a rear end portion of the fifth connecting member is rotatably connected to an upper end portion of the fourth transmission rod.
 4. The deployment system for a deployable sofa according to claim 3, wherein a limiting block is disposed at each of positions, located on two sides of the fourth transmission rod, on the bottom fixing member, and the two limiting blocks are used to limit clockwise or counterclockwise rotation of the fourth transmission rod.
 5. The deployment system for a deployable sofa according to claim 2, wherein the deployment apparatus further comprises a pedal deployment mechanism used to support a sofa pedal and capable of deploying and retracting the sofa pedal, and the pedal deployment mechanism is disposed in front of the support.
 6. The deployment system for a deployable sofa according to claim 5, wherein the pedal deployment mechanism comprises a pedal swinging rod, a front swinging member, a first link rod, a second link rod, and a pedal apparatus; a rear end portion of the pedal swinging rod is rotatably connected to the support and the second pivotal member, and a front end portion of the pedal swinging rod is rotatably connected to a rear end portion of the front swinging member; a rear end portion of the second link rod is rotatably connected to the support, a front end portion of the second link rod is rotatably connected to a rear end portion of the first link rod, and a portion, located between two end portions of the second link rod, of the second link rod is further rotatably connected to a portion, located between two end portions of the front swinging member, of the front swinging member; and both a front end portion of the front swinging member and a front end portion of the first link rod may be drivably connected to the pedal apparatus, so that the pedal apparatus can deploy and support the sofa pedal.
 7. The deployment system for a deployable sofa according to claim 6, wherein a front end portion of the front swinging member is rotatably connected to a rear end portion of a fourth link rod, a front end portion of the first link rod is rotatably connected to a position, located between two end portions of the fourth link rod, on the fourth link rod, a front end portion of the fourth link rod is rotatably connected to a rear end portion of a first plate member, a front end portion of the first plate member is rotatably connected to a rear end portion of the pedal apparatus, a second plate member is fixedly connected to the fourth link rod, an end of a tension spring is connected to the second plate member, and the other end of the tension spring is connected to a position, located between two end portions of the pedal apparatus, on the pedal apparatus.
 8. The deployment system for a deployable sofa according to claim 6, wherein the pedal deployment mechanism further comprises a U-shaped member, and the U-shaped member is rotatably connected to the first link rod and the front swinging member separately and is used to support legs of a user.
 9. The deployment system for a deployable sofa according to claim 5, wherein the deployment apparatus further comprises a back deployment mechanism used to support a sofa backrest and capable of deploying and retracting the sofa backrest, and the back deployment mechanism is disposed behind the support.
 10. The deployment system for a deployable sofa according to claim 9, wherein the back deployment mechanism comprises a third link rod, a back transmission rod, a first pivotal member, a crank, and a fourth connecting member, and the crank is fixedly disposed on the support; a lower end portion of the fourth connecting member is rotatably connected to the bottom fixing member, and an upper end portion of the fourth connecting member is rotatably connected to a lower end portion of the first pivotal member; a position, located between two end portions of the first pivotal member, on the first pivotal member is rotatably connected to the crank; and an upper end portion of the first pivotal member is rotatably connected to a lower end portion of the back transmission rod, an upper end portion of the back transmission rod is rotatably connected to a rear end portion of the third link rod, and a front end portion of the third link rod is rotatably connected to the crank, so that the sofa backrest can be deployed or retracted by driving the third link rod.
 11. The deployment system for a deployable sofa according to claim 9, wherein the deployment system further comprises a power apparatus, and the power apparatus is used to drive the support to move approximately parallel to the bottom fixing member and used to drive deployment and retraction of the pedal deployment mechanism and drive deployment and retraction of of the back deployment mechanism.
 12. The deployment system for a deployable sofa according to claim 1, wherein the deployment system comprises two deployment apparatuses, the two deployment apparatuses are respectively disposed on two sides of the sofa seat, a front drive tube and a rear drive tube are separately disposed between the two deployment apparatuses, two end portions of the front drive tube are connected to the support on a corresponding side, and two end portions of the rear drive tube are connected to the bottom fixing member on a corresponding side.
 13. The deployment system for a deployable sofa according to claim 12, wherein a power apparatus used to drive the support to move relative to the bottom fixing member is disposed on the rear drive tube.
 14. The deployment system for a deployable sofa according to claim 13, wherein the power apparatus can drive the front drive tube, so as to drive the front drive tube to actuate the support to move relative to the bottom fixing member.
 15. A deployable sofa, comprising the deployment system for a deployable sofa according to claim
 1. 